1-2z Reducing Layer 2 broadcast packets, thus saving network bandwidth.z Enhancing the security of multicast traffic.z Facilitating the implementation of per-host accounting.Basic Concepts in MLD SnoopingMLD Snooping related portsAs shown in Figure 1-2, Router A connects to the multicast source, MLD Snooping runs on Switch A andSwitch B, Host A and Host C are receiver hosts (namely, IPv6 multicast group members).Figure 1-2 MLD Snooping related portsRouter A Switch ASwitch BGE1/0/1 GE1/0/2GE1/0/3GE1/0/1GE1/0/2ReceiverReceiverHost AHost BHost CHost DSourceIPv6 multicast packetsRouter portMember portPorts involved in MLD Snooping, as shown in Figure 1-2, are described as follows:z Router port: A router port is a port on the Ethernet switch that leads switch towards the Layer-3multicast device (DR or MLD querier). In the figure, GigabitEthernet 1/0/1 of Switch A andGigabitEthernet 1/0/1 of Switch B are router ports. The switch registers all its local router ports in itsrouter port list.z Member port: A member port (also known as IPv6 multicast group member port) is a port on theEthernet switch that leads towards multicast group members. In the figure, GigabitEthernet 1/0/2and GigabitEthernet 1/0/3 of Switch A and GigabitEthernet 1/0/2 of Switch B are member ports.The switch registers all the member ports on the local device in its MLD Snooping forwarding table.
